Note: XP/ Win8/ MacOS system is not supported. Features: * 5.4 Bluetooth dual-mode and dual-channel, compatible with Bluetooth 2.0,3.0,4.0,5.0 and 5.1 specifications. * Intelligent low-power chip, RF transceiver, providing lower delay, flexible and powerful Bluetooth application. * Support Cass2 Power level 20 meters distance (in an open environment) * Support Bluetooth 5.4 dual-mode specification (LMP 12.45 real Bluetooth 5.3 standard) * Support USB2.0/3.0 interface. * Support multiple devices to connect at the same time (up to 7 devices can be connected) * Working temperature -20 to 70℃ * Operating system support: Windows 8.1, 10, 11 (driver-free, plug and play), Windows 7 system can be installed with drivers. * Support protocols: HFP/HSP (hands-free phone/headset) A2DP/ AVRCP (stereo music) HID/HOGP (keyboard and mouse), Android smartphone, etc. Specifications: Name: USB Bluetooth 5.4 adapter Bluetooth version: 5.4(BLE low power consumption, low delay) Transmission distance: 20m (in barrier-free environment) Support protocols: A2DP, HSP, AVRCP, HID, etc. Package Included: 1*Bluetooth Adapter Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement.